Welcome @Catalyst5, glad to see you found us. You may want to introduce yourself here:
I am really glad you are testing and found a solution for your son, that is exactly what this community is about. It is also interesting that you have found a good use for a rather uncommon insulin (Novolin R) which adds some interest, since so few of us currently use that insulin.
I would take a very small exception to your very low carb description. There are many that are indeed very low carb (i.e. Bernstein) and they eat less than 30 carbs a day. Many of us define 70-120 as “low carb” and above 200 as high carb. But the carb ingestion is of course a very personal thing, as is the definition. The most important thing is that you have found a combination that is working really well (A1c of 5.0% is a beautiful thing).